From recording with Paul McCartney to jamming with Jimmy Page, former Nirvana drummer Dave Grohl has always waved the classic rock flag loud and proud. He did so once again last night (June 20) with the Foo Fighters by playing a diverse and rocking collection of covers.

The Foos hit the Firefly Festival stage in Dover, Delaware last night in the headliner's slot. During the show, Grohl teased the release of the band’s new record stating, “Just so you know, we’ve made a new album. We made each song in a different city in America. We did eight songs in eight different cities. Maybe we’ll give ‘em to you at some point.”

Near the end of their set Grohl announced, “We’re gonna do something we’ve never done before. For the next 20 minutes, we’re a bar band called the Holy S-–s that plays classic rock songs.” Among the songs the group played included the Van Halen track ‘Ain’t Talkin’ ‘Bout Love,’ the Alice Cooper hit ‘School’s Out,’ the Rolling Stones’ disco dancer ‘Miss You’ and the Queen and David Bowie collaboration ‘Under Pressure.’ The Van Halen is embedded above, while the other three can be found below.

While the Foo Fighters have always been one of ballsiest hard rock groups around, we have to say, the Holy S-–s put on a helluva show.

Watch 'Under Pressure'

Watch 'Ain't Talkin' Bout Love'

Watch 'School's Out'